A haunting collection of sunken wooden barges litters this Italian river bend.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

The remains of a sunken military ship wreck visible through clear water.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Yugoslavia's biggest underground airport lies in ruins.

An ethereal glowing blue ocean cave in Croatia.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

This cliff-face port is considered a masterpiece of mining engineering.

A former mining village that now operates as an open-air museum.

A collection of sculptures that explore what's at stake when nature is thrown out of balance.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

Stalactites and stalagmites in a beautifully lit cave.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

Mysterious tombstones thought to be remnants of Atlantis.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

A Romanian church built from one single oak.

A stunning 18th century pharmacy and medieval chemist's collection.